The term 'Australian Soprano' can be summarized with two crossword solutions: Melba (5 letters) and ALTO (4 letters). Dame Nellie Melba was an Australian operatic soprano who had a major international career in the late 19th and early 20th centuries. She was one of the most famous singers of her era and was the first Australian to achieve international recognition as a classical musician. ALTO is a type of vocal range that is typically lower than soprano, and is usually sung by women.